Piezo-Electro-Optic Transducer for Stress-to-Optical Conversion
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Solution Overview
Problem
Existing technologies lack efficient methods to transduce mechanical stress into optical phenomena, particularly through the piezo-optic effect, which is limited by a low piezo-optic coupling coefficient.
Innovation Solution
A piezo-optic transducer system is developed that combines piezoelectric and electro-optic elements in a composite device, utilizing the piezoelectric and electrooptic effects to enhance the conversion of mechanical stress into optical retardance, without requiring on-board electronics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the piezo-optic effect is used to transduce mechanical stress into optical phenomena, then the transduction can be achieved, but the piezo-optic coupling coefficient is limited to approximately 1 Brewster (10^-12 m²/N)
Solution Approach 1:
The patent combines piezoelectric and electro-optic elements into a single composite transducer device, merging two separate transduction mechanisms (piezoelectric effect for mechanical-to-electrical conversion and electro-optic effect for electrical-to-optical conversion) to achieve enhanced overall transduction efficiency. This composite structure allows the system to overcome the limitations of using the piezo-optic effect alone by utilizing materials with higher coupling coefficients in each stage.
2Measurement precision
If piezoelectric and electro-optic elements are coupled in a composite device, then the effective piezo-optic coupling coefficient increases to 103 Brewster, but the device structure becomes more complex
Solution Approach 1:
The piezoelectric and electro-optic elements are merged into a single integrated composite transducer structure, eliminating the need for separate on-board electronics and external signal processing components. This integration simplifies the overall system while achieving enhanced coupling coefficient through the combined action of the two elements.
Solution Approach 2:
An electric field serves as an intermediary between the piezoelectric element (which converts mechanical stress to electrical signals) and the electro-optic element (which converts electrical signals to optical changes). This intermediary coupling mechanism allows efficient energy transfer between the two elements while maintaining a compact integrated structure.
3Productivity
If traditional piezo-optic transduction is used, then the device can be simple, but the transduction efficiency is insufficient for many applications
Solution Approach 1:
By merging piezoelectric and electro-optic elements in a composite structure, the system achieves superior transduction efficiency compared to traditional single-effect transducers. The combined mechanism allows for higher coupling coefficients and more effective conversion of mechanical stress to optical signals, making the device suitable for demanding applications despite the increased structural complexity being offset by integration benefits.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The system achieves a significantly enhanced effective piezo-optic coupling coefficient of 103 Brewster (B), enabling efficient transduction of mechanical stress into optical changes at frequencies below and above the liquid crystal response time.
Implementation Method 1
pressure applied to the piezo-electric film produces a voltage carried through the two pairs of electrodes
Implementation Method 2
causing a change in the optical properties of the LC
Data Source
AI summary
Piezo-optic transducers convert variations in mechanical stress to a change in optical properties by coupling electro-optic and piezo-electric elements in a format suited to a single composite device without needing on-board electronics.